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head job: to grind or not to grind

posted by  Rhys on  Wed Jan 18 21:12 CST 2012
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last visit: Tue Nov 20 10:22 CST 2012
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Simply because it won't correct anything. If the angles are bad, or the valve face is pounded hollow from the seat, all lapping does is make it look nice. I don't even like interference angles - I prefer 45 degrees on both, and THEN a quick lapping to prove the fit.
I realize that the Haynes manuals all seem to babble about lapping ( or as the English call it "grinding"), but that practice went out in the 50's.
Proper "valve grinding" what the English call "re-cutting" depends on accurate angles, seat width, and seat position on the valve face. Lapping does nothing for any of them.





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New head job: to grind or not to grind
posted by  woodchuck subscriber  on Wed Jan 18 15:28 CST 2012 >


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